HT DM40 User manual

Copyright HT ITALIA 2013 Release EN 1.00 - 09/09/2013
ENGLISH
User manual

DM40
EN - 1
Table of contents
1.PRECAUTION AND SAFETY MEASURES………………… 2
2.PREPARATION FOR USE…………………………………….4
2.1.Initial checks................................................................................4
2.2.Instrument power supply.............................................................4
2.3.Storage........................................................................................4
3.INSTRUMENT DESCRIPTION………………………………..5
3.1.Description of the controls...........................................................5
3.2.Display description ......................................................................6
3.3.General description of the instrument .........................................7
4.OPERATING INSTRUCTIONS………………………………..8
4.1.Initial operations and settings......................................................8
4.2.Setting of measuring reference...................................................8
4.3.Distance measurement ...............................................................9
4.4.Continuous distance measurement.............................................9
4.5.Additions / subtractions of measures ........................................10
4.6.Area measurement....................................................................11
4.7.Volume measurement ...............................................................12
4.8.Indirect 2-point measurement....................................................13
4.9.Indirect 3-point measurement....................................................14
4.10.Operations with the memory .....................................................15
5.MEASURING CONDITIONS…………………………………16
6.REPLACING INTERNAL BATTERIES……………………...16
7.ERROR MESSAGES ON THE DISPLAY…………………..17
8.TECHNICAL SPECIFICATIONS…………………………….18
8.1.Technical characteristics...........................................................18
8.2.Reference standards.................................................................18
9.ACCESSORIES PROVIDED………………………………...18
10.SERVICE……………………………………………………….19
10.1.Warranty conditions...................................................................19

DM40
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1. PRECAUTION AND SAFETY MEASURES
The instrument has been designed in compliance with
the directives relevant to electronic measuring
instruments. For your safety and in order to prevent
damaging the instrument, please carefully follow the
procedures described in this manual and read all notes
preceded by the symbol with the utmost attention.
CAUTION
In case the instrument is used in a way
different from the one described in this
user manual, this could result in a
failure of the protections the instrument
is provided with.
CAUTION
When this symbol is displayed, the
instrument is not able to emit a laser
pointer. Always prevent the laser
from radiating to your eyes, in order
to prevent any injury. Class II laser
device compliant with EN 60825-1

DM40
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In this manual, and on the instrument, the following
symbols are used:
Warning: observe the instructions given in
this manual; improper use could damage
the instrument or its components
Warning: always prevent the
laser from radiating to your eyes,
in order to prevent any injury
The instrument and its
accessories must be collected
separately and correctly
disposed of in the appropriate
containers

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2. PREPARATION FOR USE
2.1. Initial checks
Before shipping, the instrument has been checked
from an electric as well as mechanical point of view.
All possible precautions have been taken so that it is
delivered undamaged.
However, we recommend generally checking the
instrument in order to detect possible damage suffered
during transport. In case anomalies are found,
immediately contact the forwarding agent.
We also recommend checking that the packaging
contains all components indicated in § 9. In case of
discrepancy, please contact the Dealer.
In case the instrument should be returned, please
follow the instructions given in § 10.1
2.2. Instrument power supply
The instrument is supplied with two 1.5V AAA LR03
batteries, included in the package. Battery life equals
about 5000 measurements. The “ “ symbol
flashes on the display when the battery is flat. Replace
the battery by following the instructions given in § 6
2.3. Storage
In order to guarantee precise measurement, after a
long storage time under extreme environmental
conditions, wait for the instrument to come back to
normal condition (see § 8.1). Given its simplicity, the
instrument does not need any periodic calibration.

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3. INSTRUMENT DESCRIPTION
3.1. Description of the controls
Fig. 1: Instrument description
Caption Description
1 ON/MEAS key
2 Area/Volume key
3 Key for indirect distance measurement
4 Key for single/continuous distance
measurement
5 “+” key
6 “-” key
7 Key for saving measurement results
8 Reference setting key
9 Backlight/Measuring unit key
10 OFF/CLR key

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3.2. Display description
Fig. 2: Description of the symbols at display
Caption Description
1 Active laser
2 Front reference
3 Rear reference
4
Type of measurement:
Area measurement
Volume measurement
Indirect 2-point measurement
Indirect 3-point measurement
5 Single distance measurement
6 Battery charge level
7 Memory for partial data saving
8 Instrument error message
9 Max and Min measurements in
continuous mode
10 First measurement partial value display
11 Second measurement partial value
display
12 Last measurement value display and
result

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3.3. General description of the instrument
DM40 has the following functions:
Direct measurement of distances expressed in
m/in/ft and ft+in
Measurement of area and volume
Indirect 2- and 3-point distance measurement
(Pitagora)
Distance measurement in continuous mode
Sum/difference of measured distance values
Setting of measuring reference
Activation of the laser pointer for measurement
Partial operations with use of internal memory (max
20 locations)
Display backlight
The model is provided with a comfortable membrane
keyboard with 10 function keys and a class II laser
pointer for a precise definition of the application point.
The measurement of distance between two points
(with a measuring range from 5cm to 40m) is carried
out by reflection of the laser light from the surface hit
to the receiving sensor located in the upper part of the
instrument.
Measurement can be influenced by the brightness of
the environment in which it is performed and by the
type of surface hit by the laser pointer.

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4. OPERATING INSTRUCTIONS
4.1. Initial operations and settings
Press the key to switch on the instrument and
the laser pointer. Press and hold the key to
switch off the instrument.
Press the key to clear (CLR) the last datum
shown on the display.
Press the key to see the saved distance values.
Press the and keys at the same time to
delete the temporary memory's content. The value
“0” is shown on the display.
Press the key to activate/deactivate the
backlight of the display.
Press and hold the key to activate the section
for setting distance measuring units. Cyclically press
the key to select the options: “m”, “ft”, “in” and
“ft+in”
4.2. Setting of measuring reference
In order to perform correct measurements, it is
important to define beforehand the measuring
reference on the instrument by pressing the key.
Possible options are (see the following figure):
Top measurement is carried out by the upper
part of the instrument.
Bottom measurement is carried out by the lower
part of the instrument and therefore also the whole
instrument length is considered (default condition)
“Bottom” reference “Top” reference

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4.3. Distance measurement
1. With the instrument in stand-by, press the key
to activate the laser pointer
2. Use the laser pointer to precisely determine the
measuring point, keeping the instrument as
perpendicular as possible with respect to the
surface of the object to be measured
3. Press the key again for measuring. The value
will be displayed in the selected measuring unit
(see § 4.1) and the result will be automatically
saved in the memory area
4.4. Continuous distance measurement
Upon start-up, the instrument is set to normal mode or
measuring the distance between 2 points. Continuous
measuring mode allows for a dynamic management of
the distance and the display of the maximum and
minimum measurement values.
1. With the instrument in stand-by, press the key
to select the desired type of reference (see § 4.2)
2. Press and hold the key to activate the
continuous measuring mode. The indications “Min”
and “Max” are shown on partial displays
3. Press the or OFF/CLR key to stop continuous
measurement. The function is automatically
stopped after approx. 20s
4. The minimum and maximum value of distance are
shown in the partial displays while continuous
measurement is shown dynamically when moving
the instrument (see Fig. 3) in the resulting display
Fig. 3: Examples of continuous measurements